What it means
The control module monitors whether starter relay A switches off when commanded. It sets this code when the relay remains electrically on after an off command.
At a glance
- Usually lights the check-engine light
How it works
Starter relay A switches power to a starter circuit when the module requests cranking. The module monitors whether relay A turns off afterward and sets P26F0 when it detects that the relay remains electrically on despite an off command.
Common causes
Most likely first.
- Starter relay contacts stuck closed
- Relay control circuit fault
Symptoms
- Starter may continue engaging after the engine starts
- Unusual starter noise
- A starter or powertrain warning light may appear
How to diagnose it
- Check freeze-frame data and scan-tool relay commands to confirm whether starter relay A was commanded off while the fault was detected.
- With the vehicle secured and ignition off, inspect relay A and its socket for heat damage, corrosion, or a relay that is not seated correctly.
- Check whether the starter continues to engage after the engine starts; avoid repeated starts if it does.
- Test relay A contact operation and its control circuit against the manufacturer's procedure, checking for a stuck contact or a command wire held on.
- If the relay and wiring pass, check the module's relay command and feedback circuit for an electrical fault.
Common fixes
- Reseat relay A and clean or repair its socket terminals if they are loose or corroded.
- Replace starter relay A if its contacts remain closed when de-energized.
- Repair a relay A control wire that is keeping the relay energized.
- Repair the control or feedback circuit if testing identifies a module-side wiring fault.
Can I keep driving?
If the starter keeps engaging after the engine starts, stop the engine and do not continue driving; a continuously powered starter can overheat and cause further damage. If there is no continued engagement, arrange prompt repair and avoid unnecessary restarts.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.